Ventilator



(Model.

P. ABRAHAMSON.

VBNTILATOB.

Patented Jan! 15, 1889.

N. PETERS. P'IMQMW, Wablngibn. D. C.

NITED TATES FFICEQ AT NT VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 396,134, dated January 15, 1889.

Application filed July 27, 1888. Serial No. 281,240. (Model) T0 ail whom it may concern:

Be it known that 1, PETER ABRAHAMSON, of the city and county of San Francisco, State of California, have invented an Improvement in Ventilators; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of ventilators for buildings, houses, apartments, &c., in which a passage is formed or let into the wall, said passage having apertures at opposite sides and at different elevations, one aperture communicating with the interior and the other with the exterior; and my invention consists in a box or casing provided with a central partition dividing it into two inclependent passages, each of which has apertures communicating, the one with the interior and the other with the exterior, said apertures being on opposite sides and at different elevations, the apertures on the same level in the two passages being reversed with respect to the side with which they communicate, all of which, together with details of construction, I shall hereinafter fully describe by reference to the accompanying drawing, in which the figure is a perspective view of my ventilator, portions of the walls being broken away.

The object of my invention. is to provide in a single box or case separate ventilatingpassages in which the communication with the interior and exterior is reversed in the two passages, whereby a current of pure air may enter and a current of impure air may make its exit without interfering.

A is the box or casing, designed to be let into the wall of an apartment or building in any suitable location. This box or case has a central transverse vertical partition, B, dividing it into two passages, C and D. The passage C has an aperture, 0, at the bottom communicating with the outer air, and an aperture, 0, at the top and on the inner side communicating with. the interior of the apartment. The passage D has an aperture, (Z, at its upper portion communicating with the exterior air, and an aperture, d, in its lower portion and on the opposite side communicating with the interior of the apartment. will thus be seen that each passage has a communication with the out-er air and with I the interior on opposite sides and at diiferent elevations, the communications in the two passages being reversedthat is to say, while the passage 0 has a communication below with the outer air and a communication above with the interior, the passage D has acommunication above with the exterior and a communication below with the interior. Thus two independent passages are formed providing for the incoming current of fresh air through one passage and the exit of impure air through the other passage without interference of the two currents with each other.

F are deflecting-plates within the passages, which are for the purpose of breaking up the draft through the passages.

Now, in order to obtain as great a superficial surface as possible for all the apertures of the passages, I make the box or case A of the following novel construction: It has the shape in cross-section of a double T, whereby side extensions, c c (Z (1 are formed at the bottom and top of each passage. These extensions I make the whole length of the box, and in each I place a plate, H, (four in all,) each plate connecting the end of the box with the central partition, and thus each extension, though of the entire length of the box, is connected only with its proper passage that is to say, extension 0 communicates with aperture 0, extension 0 with aperture 0, extension (1* with aperture (1, and extension (1 with aperture (2. The faces of these extensions are prcferalj ly made of perforated or screen material, as shown.

I do not wish to be herein understood as claiming as my invention the separate passages merely, for these are known in ventilators; but I do not know that their communicating apertures have ever been arranged on opposite sides and the reverse in the two passages.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A ventilator for the walls of buildings, houses, apartments, &c., consisting of a box or case having a central partition dividing it into independent separate passages, each passage having an aperture on opposite sides and at different elevations, one eoninuinieating with the outside and the other with the inside, the apertures on the same level in the two passages being reversed with respeet to the side with which they eoinniu'nieate, substantially as herein described.

In a "ventilator for buildings, houses, apartments, &e., a box or easing having a central partition dividing it into two independent separate passages having on opposite sides and at di'lierent elevations an aperture eonnuunieating the one with the inside and the other with the outside, the apertures on the same level in the two passages being reversed with respect to the side with which they eolnn'ninieate, and the detieeting-plates within the passages for breaking u p the draft, substantially as herein described.

In a ventilator, a box or case having a partition dividing it into independent separate passages, eaoh passage having an aperture on opposite sides and at ditterent elevations, one eonnnunieating with the outside and the other with the inside, the apertures 

